日志管理

authpriv.*                                              /var/log/secure
#服务名称[连接符号]日志等级　　　　　　　　　　　　　　　　　　　　日志存储位置
#认证相关服务.所有日志等级　　　　　　　　　　　　　　　记录在/var/log/secure日志中

日志服务[连接符号]日志等级                        日志记录位置

[root@centos2 ~]# vim /etc/rsyslog.conf 
#查看配置文件内容
# rsyslog configuration file

# For more information see /usr/share/doc/rsyslog-*/rsyslog_conf.html
# If you experience problems, see http://www.rsyslog.com/doc/troubleshoot.html

#### MODULES ####
#加载模块

# The imjournal module bellow is now used as a message source instead of imuxsock.
$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)

$ModLoad imjournal # provides access to the systemd journal
#$ModLoad imklog # reads kernel messages (the same are read from journald)
#$ModLoad immark  # provides --MARK-- message capability

# Provides UDP syslog reception
#$ModLoad imudp
#$UDPServerRun 514
#加载UPD模块，允许使用UDP的514端口接收采用UDP协议转发的日志


# Provides TCP syslog reception
#$ModLoad imtcp
#$InputTCPServerRun 514
#加载TCP模块，允许使用TCP的514端口接收采用TCP协议转发的日志



#### GLOBAL DIRECTIVES ####
#定义全局设置


# Where to place auxiliary files
$WorkDirectory /var/lib/rsyslog

# Use default timestamp format
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
#定义日志的时间使用默认的时间戳格式

# File syncing capability is disabled by default. This feature is usually not required,
# not useful and an extreme performance hit
#$ActionFileEnableSync on
#文件同步功能。默认没有开启，是注释的。

# Include all config files in /etc/rsyslog.d/
$IncludeConfig /etc/rsyslog.d/*.conf
#包含/etc/rsyslog.d/目录中所有的“*.conf”子配置文件。

# Turn off message reception via local log socket;
# local messages are retrieved through imjournal now.
$OmitLocalLogging on

# File to store the position in the journal
$IMJournalStateFile imjournal.state


#### RULES ####
#日志保存规则

# Log all kernel messages to the console.
# Logging much else clutters up the screen.
#kern.* 
#kern服务.所有日志级别　　　　　　　　保存在/dev/console                                                /dev/console
#这个日志默认没有开启，如果需要，则取消注释

# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
*.info;mail.none;authpriv.none;cron.none                /var/log/messages
#所有服务.info以上级别的日志保存在/var/log/messages日志中。
#mail,authpriv,cron的日志不记录在/var/log/messages日志文件中，因为他们都有自己的日志文件
#所以/var/log/messages日志是最重要的系统日志文件，需经常查看！


# The authpriv file has restricted access.
authpriv.*                                              /var/log/secure
#用户认证服务所有级别的日志保存在/var/log/secure日志中

# Log all the mail messages in one place.
mail.*                                                  -/var/log/maillog
#mail服务的所有级别的日志保存在/var/log/maillog日志中。
#"-"号的含义是日志先在内存之中保存，当日志够多之后，再向文件中保存

# Log cron stuff
cron.*                                                  /var/log/cron
#计划任务的所有日志保存在/var/log/cron日志中

# Everybody gets emergency messages
*.emerg                                                 :omusrmsg:*
#所有日志服务的疼痛等级日志对所有在线用户广播

# Save news errors of level crit and higher in a special file.
uucp,news.crit                                          /var/log/spooler
#uucp和news日志服务的crit以上的日志保存在/var/log/spooler日志文件中

# Save boot messages also to boot.log
local7.*                                                /var/log/boot.log
#local7日志服务的所有日志写入/var/log/boot.log日志中
#会把开机时间的检测信息在显示到屏幕的同时，写入/var/log/boot.log日志中

# ### begin forwarding rule ###
#定义转发规则
# The statement between the begin ... end define a SINGLE forwarding
# rule. They belong together, do NOT split them. If you create multiple
# forwarding rules, duplicate the whole block!
# Remote Logging (we use TCP for reliable delivery)
#
# An on-disk queue is created for this action. If the remote host is
# down, messages are spooled to disk and sent when it is up again.
#$ActionQueueFileName fwdRule1 # unique name prefix for spool files
#$ActionQueueMaxDiskSpace 1g   # 1gb space limit (use as much as possible)
#$ActionQueueSaveOnShutdown on # save messages to disk on shutdown
#$ActionQueueType LinkedList   # run asynchronously
#$ActionResumeRetryCount -1    # infinite retries if host is down
# remote host is: name/ip:port, e.g. 192.168.0.1:514, port optional
#*.* @@remote-host:514
# ### end of the forwarding rule ###